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https://issues.apache.org/jira/browse/SOLR-2599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121327#comment-13121327
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Jan Høydahl commented on SOLR-2599:
-----------------------------------

Perhaps {{multival}} should be renamed {{multiValued}} to comply with schema 
lingo?

Also, if I make it (optionally) schema aware, I can set {{multiValued}} 
behavior as default if {{dest}} field is multivalued. Also, perhaps it makes 
sense to allow {{append}} for {{multiValued}} as well, and let it append all 
{{source}} fields to a string, and then adding this concatenated string as one 
single field value instead of each {{source}} as its own value?

The reason I want to be able to disable strict schema checking is in the case 
where a processor creates intermediate fields only, which we know will be 
removed from {{SolrInputDocument}} before indexing, so that we can be free to 
name it whatever we like without causing an error. Unfortunately, 
{{ExtractingRequestHandler}} is too strict here and would benefit from a 
{{enforceSchema=false}} option.
                
> FieldCopy Update Processor
> --------------------------
>
>                 Key: SOLR-2599
>                 URL: https://issues.apache.org/jira/browse/SOLR-2599
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>            Reporter: Jan Høydahl
>            Assignee: Jan Høydahl
>         Attachments: SOLR-2599.patch
>
>
> Need an UpdateProcessor which can copy and move fields

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